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Short-Term Borrowings - Average Balances and Cost of Funds (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Short-term Debt [Line Items] |  |  |
Average Balances | $ 155,735 | $ 217,547 | $ 356,929
Cost of Funds | 2.10% | 1.22% | 0.45%
Federal Home Loan Bank short-term advances |  |  |
Short-term Debt [Line Items] |  |  |
Average Balances | $ 147,749 | $ 208,332 | $ 344,724
Cost of Funds | 2.21% | 1.27% | 0.46%
Securities sold under agreements to repurchase |  |  |
Short-term Debt [Line Items] |  |  |
Average Balances | $ 7,986 | $ 9,215 | $ 12,205
Cost of Funds | 0.17% | 0.17% | 0.20%

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- Definition Weighted average interest rate of short-term debt outstanding calculated at point in time. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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